Mobile App not working

Hi,
i have installed jitsi meet in my datacenter. It is only accessible in the internal network in MPLS. FQDN conferences.mydomain.com with my valid certificate. The server is not public.
With chrome it works, it detects that the site is safe.
But from android mobile app it doesn’t work.
Only reconnecting…

Why?

Thank you!

Is the mobile app on the same network?

Yes… My smartphone android is connected to wifi!

I tried with iPad … It works!